How do I claim the $300 foreign tax credit? I have slightly more but its easier to just take the $300 credit. I can't figure out how to enter it on the screens?

To claim a foreign tax credit, or deduction, see the following FAQ:

https://ttlc.intuit.com/replies/3302405

What is it you can't figure out?  I can't tell based upon your question.

How to enter $300 for the foreign tax credit so I  don't have to complete the foreign tax form

You can't just enter a credit, you have to fill out the form.