How do I stipulate T or S for interest/dividend income on Sch B?

[Just-Lisa-Now-]

If you have the TSJ indicators ON, you should see a little T at the end of the entry description line.  Click that.

If you dont have them turned on, TOOLS> OPTIONS> General and its about mid screen toward the right side you can check the box to turn them on.

[greenfarms]

or you can right click on the line and it will let you choose