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Hello, i recently got forge and was playing with a friend, was trying precostructed deck Jace, arcane strategist.
I do not get any visual confirmation or any other info on the card when i proliferate with eg kiora's dambreaker.
Can anyone tell me how to activate it or where i can see what cards i have selected to be proliferated.
Thank you.

I am playtesting the Jace, Arcane Strategist preconstructed deck to see what you are looking at. I just summoned Bloom Hulk and got this message:

Bloom Hulk (23) - When Bloom Hulk enters the battlefield, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.) [Zone Changer: Bloom Hulk (23)]

The cards that are legal choices are bright and everything else on the battlefield is shaded. I select one I want to give a counter to, and a blue circular symbol appears on it. I click Okay and a second +1/+1 counter appears on it.

So my game is operating as expected. What happens when you try to use Proliferate?