I have entered my interest income from my bank and want to enter my interest income from another institution. I hit add/edit but it doesn’t load any options

If you are not getting any options, I suggest clearing your cookies and cache to start (How to clear your cache). 

Here's how to enter a 1099-INT into TurboTax Online manually:

Open TurboTax Online and navigate to Wages & Income > Investments and Savings (1099-B, 1099-INT, 1099-DIV, 1099-K, Crypto) > Add/Edit

1. Choose the button Add Investments
2. Under Let's import, choose Enter a different way.
3. Choose Interest, continue
4. Choose Type it in myself
5. Enter FEIN from payer, payer's name, and amount of interest. Choose recipient's name from dropdown box.