You can always ask support for more slots too. But you'll probably hear back from your GA winners before support gets around to your ticket. Short on staff and heavy on users y'know?

If i read the rules correctly i think it's up to 7 days before support will do anything about it. Just give it time, i've noticed most people do it within 24-48 hours.

That's a feature they're adding in SGv2 :D

It seems no one's given you a proper answer yet. Firstly, as per the site rules, someone has 7 days to send a gift once a giveaway is over before you're allowed to mark it as not received (when you're a winner). This also means, that a recipient has 7 days to mark a win as received. If people don't mark your game as received within 7 days of the giveaways' ending time, you can make a support ticket explaining the matter, preferably with some proof that you sent the game (screenshot of an email / steam chat). Support can mark something as received for you in such cases.

My 2 cents? Add people on Steam, and give them wins through chat, and only once you've established contact (i.e. they respond to you). I never give people wins through email - it's one-way communication. They might be new to the site and not know to mark stuff as received, there might be a language barrier, or they might just be jerks. If you give them stuff through chat, they can't claim they didn't get the game from you, nor is there any doubt as to them receiving / seeing their win (as when you're worried your mail might have gone to their spam folder, for example, or that they simply haven't checked their email). Also, it's easier to make sure they mark it as received.

Furthermore, there's a link on the bottom right of all pages on the site leading to the FAQ, which also has the site / forum / chat rules in it. I know, it doesn't exactly stand out. SGv2 should change that.

Here's a link to the FAQ, for your convenience.

Also handy for new users, check out this formatting guide to learn how to make clickable links

and

do

fun

stuff

like

this!

Code blocks can be useful for when you want to use anything that would otherwise be parsed as markdown. Like, when you want to say stuff like

 hi there *; without making a code block, the text between these two * would be in italics.