formulas – Google Sheets: How to add data in a specific row after searching a column for a specific keyword?

So I’m trying to figure out how to have sheets look in the username column for a specific username and then find the sum of the numbers in the “kills” column that are in the same row as that specific username.
For Example: I want it to Look for the username “Sinz_y” and for every row that has the name Sinz_y, I was it to find the sum of the “kills” in those rows.