Simple IF function

Hi all,

I'm get a sheet every month with the hours that my employees worked.
Now, I want a sheet to summarize the first sheet. This is (part of) the sheet with all the information that I want to use:

Capture.PNG
Attachment 481760
It needs to check if Column F in the sheet2 above (the name) is the same is as in cell B4 (for example, see attachment below) in sheet 1. If the result is True, then it needs to add column H (the hours worked on 1 day) and add this value to the corresponding month in Sheet1. But all hours of that month, from a certain employee need to come in that cell.

Capture2.PNG
Attachment 481763

Does anyone know how to do this? If you need more explanation, please tell me!

Thanks for the help!