Open Premier Pro by typing 'Premier Pro' into the search bar at the bottom of the screen and clicking on 'Adobe Premier Pro'
Once open, you should be met with a screen like this:
click on new project at the top left hand side
Navigate to where the files you want to convert are.
Select the file.
click on create at the bottom right hand side.
You will be met with a screen like this, where the video on the right hand side is the one you want to convert.
Click on the 'export' button at the top right hand side, it is the one in the middle.
you can change where the export location is by clicking on the blue text and navigating to where you want to export to.
click on export.
Once complete, repeat for next file.