Macro that will find all times and add this formula

Hello All,

I am trying to crate a macro that will find the times on this sheet and add this formula in the yellow highlighted cells. =C15+TIME(6,30,0)

The issue it it will be used on multiple time cards like this but they will not all be the exact same. The cards will all look like this but the times may not be on the same rows (they will be on the same columns though). In other words this card may populate more shift times and some fewer.

I am attaching an example and the yellow highlights is where i need the formula to populate. As you can see in red font i did the first one. What i need this macro to find is the (start time plus 6 hrs and 30 minutes) in all highlighted areas.

Any ideas will be greatly appreciated!