how do u earn points on tremorgames ?

Best way - tasks. http://www.tremorgames.com/index.php?action=offers&tab=8

It differs per country you are in.
Crowdflower is for everyone, but it takes level 3 for good tasks, but very hard to get to.

Do surveys if you can.

Playing and getting achievements for species games, doing tasks, trading in extra CSGO skins and trading cards they need to stock on, stuff like that.

For the free Trash TV game you need to get coins from offers, other things don't count, Also, if this an account you just created to get this free game, if it wasn't created 3 days before it started you cannot get the game.

the good thing is i got 31 already how do i get more

Sorry to disappoint, when it says you already got 31, it's very likely those don't count.
I haven't looked into that particular offer, because it doesn't cards anyway, but usually
those free game offers from Tremorgames require you to earn 50 coins with offers
since the free game is available (coin you got earlier, or by means of login bonus,
facebook liking them, daily bonus or crowdflower don't count).

The easiest way to earn coins with an offer is to pick some mobile offer, like install app
xy and run it. If there's any of those offers available to you. The Supersonic offerwall usually
has some for me (in Germany). That's if you got a cheap android device or iphone that you don't mind
resetting later on, in case that app comes with a whole lot of ads/unwanted sutff you
don't want on your device. Otherwise you can use an android emulator like bluestacks.

I can't even register there :c tells me 'only 1 account per 1 pc and ip' but I never had one...guess it's IP problem

I watch videos mostly on supersonic. Usually get about 20 coins/day.
Also install some android games an play and get coins but most of the time you need to take screenshot and make a support request because they dont deliver the coins.

I have managed to complete 2 surveys out of around 50. So dont know how people manage to get coins from those :)