Modify
In technology to modify something means to change or change the  adjustment on something.

Sometimes modifying something can make it better or give it a new use.

Also modifying something can make it look better.
In technology, "repurpose", "reuse" and "modify" are closely related.  When you reuse something like empty cereal boxes to make a cube, you are using something that already exists. 

Modification means changing something and making something new. When you modify something you are not making something from the beginning.

One of the best examples that I can show you is how I took a five finger music chalkboard staff liner, removed the middle finger with a pair of vice grips, inserted red chalk on the outside and blue chalk in the middle.

Now I had a cursive writing chalkboard guide which matched my students’ notebooks. I therefore modified and repurposed the guide.