I've made you an Admin now.
Up under your name at the top left (just below the 680FP pic) there should be four words now:
Go to APPROVE, and under AWAITING APPROVAL tab, that's where the new yet to be approved members end up. The spammers are quite easy to spot, they often have weird names with lots of numbers, they often post from .xyz or .ru domains etc. But once in awhile there are a few legit ones that also have strange emails, so when you're uncertain, that's when you need to click on the IP ADDRESS to the right of their email and username. Unfortunately, it's not automated that it searches and checks that those IP addresses are spam heavy, so what you need to do on the questionable ones is to copy it and do a Google search. If they come up as spam or banned IP's, then you know it's a spammer. This is the time consuming part, but thankfully, there are normally only 1 or 2 legit users per 10 pages, maybe even less. After a little time you'll be able to very quickly spot which one is a spammer and which one is not, so you don't have to do an IP check.
Once you've determined that they're spammers, just MARK it by ticking the box to the right, then drop down to bottom of the page and use the dropdown menu that says WITH SELECTED: and choose REJECT.
If on the other hand it's a legit member, mark it in box and press APPROVE AND SEND EMAIL.
That's it. And thanks!