Click Settings

Choose Apps

Choose iMPlayer

Choose Uninstall

Click OK

Click the Home button on the remote and choose Search

Now type implayer using the onscreen keyboard and click Search

Select iMPlayer TV IPTV Player

Click Install

Click Open

Choose Allow for access to photos and media

Wait a few minutes for content to load

Once the content is done loading

Click the home button on the remote and press down to go to Your apps. 

Press Right until you get to the last app which will be iMPlayer

If you don’t see it in the list choose See all

While hovering on iMPlayer, Long press the select button and choose Move

With the directional pad move it until it is the first app in the list and hit select

Press Home on the remote and now iMPlayer will be the first app under Your apps section