Opencart adjustments

I need to do some adjustments as the following:

Changing the products display photos in the fashion section with an explanation in a video T1
Modifying the display user name of the members, the user name does not appear correctly in the upper left corner in the web page with an explanation in a video T2
Changing the Language icon from Saudi Arabia to Qatar T3 with video explanation
Changing WA image T4 with video explanation

Removing some of the fields that register users need to fill

Company name – T5 removed with a video explanation
Selection of countries – only one country setting T6 with a video explanation