Make modification in WordPress theme LMS Masterstudy

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Make modification in WordPress theme LMS Masterstudy
I have a word press theme LMS master-study bought from envato. it has some small errors for a person who knows word press. website is [login to view URL]
problems to fix:
1. Buyer dont`t receive email confirmation after place an order . NEED TO FIX
2. Zip code from forms Billing and Shipping need to NOT BE requested field .remove the * NEED TO FIX
3. problems with Courses . when a instructor post a course if i activate the option request moderation when i as admin approve the post the post have some problem it cant be approved also i don`t receive email regarding approving the post . NEED TO FIX
When i grant some one instructor privilege they can start create groups and post projects. and have some problems here . so problems in this area are :
1 The Instructor can log in on the wordpress page it doesent have the admin privilege but i DON`T WANT TO HAVE ACCESS THERE they need to have acces only on site NOT in the back of the site with instructor account. NEED TO FIX
2. when i create a grout i can`t upload a picture from add files only from Drag and Drop . not all the people know that ned to fix upload picture . NEED TO FIX
3. a delete button for instructor to delete groups and courses .for instructor user . in this moment only admin have this option from admin panel. NEED TO FIX
4. when a instructor create a group and send a invitation for his students . the students don`t receive email or the invitation don`t appear in their account to accept it . need to fix that
5. When a Instruct create a course it have an option to upload a video or a link from youtube after i post the course that part don`t work. It works to insert from that description course it have an option there to insert link not all the people know that . need that option where video is to work.
6 on first page it has 3 square CUM FUNCTIONEAZA CURSURI TRAINER. THE TRAINERI part need to be linked to instrcutors page
Skills:
WordPress
, PHP
, HTML
, CSS
, Website Design

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