Online Registration Procedure:
1. Students may access the online registration website, http://regist.psu.ac.th/, from within or outside the Campus, using Web browsers Internet Explorer v.5, or Netscape Navigator v.4.7, or higher versions of the browsers.
2. Fill in Username and Password assigned by the Registration Office; select the academic year and the semester one wishes to register, and click “OK”.
3. A window with the word “Auto Complete” is shown; click “No”.
4. Click “Yes” after the word “Security Alert” is shown.
5. To add subjects:
       5.1 Click “Add New”.
       5.2 Fill in the subject number or subject name in the “search word” box, then select “Find” if it is not a thesis subject, otherwise select the word “Find here”
       5.3 A new window is shown with the listing of every subject corresponding to the keyword selected in step 5.2, select the required section of the desired subject upon which a link is then established to permit the selection of the type of registration (credit, or non-credit, or audit). If it is a thesis subject, there will be additional box into which the number of credit to be enrolled must be filled in. Click “Add”.
        5.4 Repeat steps 5.1-5.3 for each new subject one wants to register.
REMARK Care must be exercised in selecting the subject required because there exist subjects with the same name but different in subject numbers, and those with the same subject number but different in names.
6. Addition/ Withdrawal of subjects:
       After completing step 5 of the registration process, students may access the system anew for the addition/withdrawal of subjects.
       6.1 Withdrawal of subjects:
          6.1.1 Select the subjects one wants to withdraw, from the list of confirmed registration subjects.
          6.1.2 Click “Withdrawal” and the subjects are then shown separately.
          6.1.3 Click “Withdrawal” button one more time to confirm the subjects to be withdrawn.
          6.1.4 To make final decision on withdrawal/ deletion of withdrawal.
               6.1.4.1 Click “Delete withdrawal” to delete all the subject originally selected for withdrawal (do not wish to withdraw any subject)
               6.1.4.2 Click “Check All” to validate the subjects desired to withdraw.
               6.1.4.3 Click “Registration” to confirm the withdrawal.
       6.2 Addition of Subjects:
          6.2.1 Perform the operation of steps 5.1-5.3, and the subject to be added are shown.
          6.2.2 Correction of number of credit or type of registration
               6.2.2.1 Select the subject needed to make a correction, then click “Edit”. The subject to be edited will be shown. Select the correct type of registration, C: Credit, or N: Non-credit, or A: Audit, (Editing of the number of credit is permitted only if it is a thesis subject.)
               6.2.2.2 Click “Edit” .
          6.2.3 Deletion of the subject
               6.2.3.1 Select the subject one wants to delete, then click “Delete” and a window shows the subject.
               6.2.3.2 Click “Delete” to confirm the deletion.
          6.2.4 Click “Check all” to verify the validity of addition of subjects. If problems exist for any subject, the probem will be stated, otherwise the statement “Every subject is valid and ready for registration” will be shown.
          6.2.5 Click “Registration” to confirm the addition of subjects.
7. Sign out after finishing the operation.

website http://reg.psu.ac.th/manual/index_.htm