How to know how much Premium Credits an action will use ?

Hello,

I understook the Premium Credits system and I have 4.000 Premium Credits each month (first time I'm using it) but I can't find how much each generation will cost me ...

For example, I want to train myself with Firefly Image 4 Ultra and when I place my mouse over the "Generate" button, I was expecting to see some information like "it will use 4 Premiums credits" or something like that ... but I don't see anything ... and I'm a little bit afraid of using 100 credits for a stupid try.

Can you help me please ? Or suggest to add this information ?

Thanks