Wanted to know how you return a game, anyone knows that?

If you have already downloaded it then you can't return game.
Btw what game do you want to return?

In order to be eligible for a refund, you must have either:

a) not downloaded any file from the game in question
b) faced significant problems that prevent you from launching the game or running it terribly

In both cases, no more than 30 days must have passed, otherwise you lose your right to a refund.

In the case of a), go here, select "preorder cancelation" as the problem type and explain to support that you want a refund. In the case of b), you should contact support from the game's specific support section (accessible via "More", "Support" from your account), work with support in an attempt to fix the game for you and if nothing works, they should refund you.

i want to return europe universalis, i cant get it to work noone in the community can answer my question ans its my last game i ever buy here.

Well then...

Is your problem that the game won't run on Windows 10? Unfortunately, Europa Universalis doesn't support Windows 10 and I'm not sure if you're going to have any luck, but you could try contacting support about this by going here.

How do I return a game after I'm done with it?

Easy.

1. Get into your time machine
2. set the date to 5 minutes after you bought the game
3. make sure the flux capacitor is fluxing
4. accelerate to 88 mph
5. avoid pines, cinemas, traffic and libyan terrorists
6. apply for a refund
7. profit

Why is that? Seems you've been a member for a while. Why would you suddenly decide to stop buying games here?

I saw a thing on TV about how almost impossible it would be to get a DeLorean up to 88. :P The car was built with a teeny tiny engine and was of course covered in stainless steel, so you might hit 88 but it is going to take a hell of a lot more than a mall parking lot to do it. XD

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I saw a thing on TV about how almost impossible it would be to get a DeLorean to actually travel back in time. :P

Obviously Doc Brown first discovered the basics of time travel including the 88 mph threshold, then got a DeLorean (cause style, baby) and retrofitted a souped-up engine, gear box and suspension. After all, if you've already stuffed a nuclear reactor in the back, a) you'd have to anyway if you'd like the thing to move faster than a wheelchair, and b) that wouldn't really put a dent in the budget any more.

See, it all makes perfect sense!

I'm not so sure.

The former would usually be "it's the last game I ever buy here".
The latter would usually be "it's the latest game I have bought here".

I tend to believe the OP intended the former.