You’ll need to post a tester call through your pattern. There is a little clipboard on the photo of your pattern before you publish it. Click on it and select post a tester call. This will automatically take you to the community and have a post for you to fill out. You’ll enter the due date and any requirements you have just like you did in this post. Testers will be able to click on the pattern photo to apply. Then you’ll be able to select your testers 
There is also an option for an application link. You could copy and paste it into this post
Check out the testing guidelines for more info 
If you are not testing a pattern you have uploaded to your Ribblr shop and have a pdf version, you will need to state that in this post so people know what they are signing up for 
you’ll also want to state where the test is taking place for your pdf whether that is Instagram or a group chat here on Ribblr.
Also, welcome! And your pattern is adorable and does not look like AI at all!