From this point, Google will walk you through it. In the end, you will be redirected back to MonitLabs.
Just remember to use the Google account that has the access to your websites. If you operate on multiple Google accounts with different GSC properties in each, just grant access to all the desired websites to this Google account which you have just integrated with MonitLabs.
Here is a quick how-to from Google.
That’s it. You can start exploring your Google Search Console Data and create custom reports.