Step 1 - Add the "Colorize" effect on the Effects tab
After adding the effect, you can choose which color you'd like.
Warning: This will affect the "Chroma key" or "Greenscreen" found in the templateTo solve this, see next step below
Step 2 - Move the "Colorize" effect on top of any other effects.
You can do this by simply putting the "Colorize" effect on top of any other effects. Note: If the template already contains the Colorize effect, then only put the Colorize effect you've added below that effect.