To open/show the form with with your own button or link you can use: srv.openModal(true,'formkey')
You can add this code to your button: <a onclick="srv.openModal(true,'form-key')">feedback</a>
You need to specify it with the form key, which is the unique identifier for that particular feedback form. You can grab that key from the preview page:
The full code for a link or button would then be:
<a onclick="srv.openModal(true,'2a8f783514fa91e03666bbb8c444ac4a0b967074')">Your feedback</a>
Then additionally, to hide the Mopinion button, go to the feedback form editor. (Replace "app" for your dedicated Mopinion subdomain if needed.)
And then click the Design Tab, and then the custom css icon in your theme.
There you add this line:
Well that's it... You are good to go!