You create those requirements in the transcript editor (what you see when you log in to work on a transcript). Click on Manage at the top left of the transcript editor. This will open a drop down menu. Click on Subjects to open a new window where you can access individual subjects and set the required amount of credits for each subject. 

After clicking on Subjects, a new window opens where you can access each individual subject. Click on the Subject name that you want to edit. 

Click in the box where the credit requirement is set to change the required number of credits. Click Save after each addition.   

If you need to delete any item, access Subjects, then choose the Subject you want to delete. Be aware that you won't be able to delete a subject name used on other transcripts until you change the subject name to a different one. Click on the red Delete button and then click on Save.