New Customer: Several Issues, Image Ads, Stuck on Load, Social Links, Repsonsive

I need help handling the following issues:

1) Can’t update Image Ads (HTML code doesn’t work, Image Ad Image upload doesn’t work and gets stuck in a loop.)

2) Responsive elements on mobile show demo content, despite being removed. The logo is not responsive and touching the search icon and mobile menu. The top menu on mobile can’t be removed and shows empty white space.

3) Social Media links won’t connect. Gives permissions error.

4) Not sure how to integrate Mailchimp with subscription form.