If you’re trying to check your products and you can’t click on the “Check” button this means you probably have an ad blocker add-on that is preventing the structured data testing tool from opening up.
The structured data testing tool tries to open in a new tab so unfortunately it may be prevented by an ad-blocker.
Step 1: To fix this, just disable your ad-blockers. For Chrome users, click on Window, and then Extensions. Disable your extension from here.
Step 2: Refresh your validation page and try again. It should now work this time around.
However, keep in mind that the structured data testing tool is a 100% optional step.
Its just there so you can check and see that the structured data is actually there. You can skip this step if you would like to.