What is the criteria or value found in H7?
=SUMIF(The range you're testing for a certain criteria, the specified criteria, The range with numbers to sum if the specified criteria was met)
IF you only wanted to include only the positive values, you could do the following:
=SUMIF(E:F,">=0",F:F)
Otherwise, it should automatically include all negative values too.
If you're specifying a positive value in H7 and want to include the negative version of that value in your criteria, you could also try something like this:
=IFERROR((SUMIF(E:F,H7,F:F)+SUMIF(E:F,H7*-1,F:F)),"NOT AVAILABLE")