Hi @seanbett98 
Welcome to the forum!
To become a Lovehoney tester, you need to have ~ 8-10 tester quality reviews already published. Do you already have these for other (non anal play) products? Strokers, lubes, underwear, etc.?
As @our-adventure-bed advises, have a read of The Great Big Review and Testing Guide (though I’d start at the beginning rather than the Secret Tester FAQs 
) as it will give you all the information you need to become a tester.
If you do not yet have any reviews written then I’d suggest simply getting an anal starter kit or some basic starter toys, there are lots available on the site, have a play and write up some informative, useful reviews from the beginner’s perspective. These will be helpful for future potential purchasers and set you up for testing in the future.