Modify settings on website

I recently migrated my website. It's complicated as my website designer didn't know what he was doing. I had a [login to view URL] website. I created a new website on [login to view URL] and then migrated it back to wordpress.org. Thiings have got complicated and there are several problems concerning the functionality of my webstie. 1. many of the buttons I click on no longer seem to work. The ones I have noticed are: SEO (yoast) is present but no longer opens. Media (Gallery) No longer displays. Widgets no longer open. Insert links/break links on edit page/posts no longer open. Screen options/help on edit page/post no longer open. I feel this is the same problem as all of the buttons have one thing in common. I click on them and nothing happens or opens. I also have a problem with the text which is blue (for links, background of menu) etc. I would like this to be changed to grey. On [login to view URL] I paid $99 and upgraded to premium to change the colour so it should be an option somewhere... I would love to be able to continue working on my website so am looking for someone that can make the changes and find a way to get my website working again as soon as possible. I need an experienced website designer... Thank you