Updating value in temporary table using select statement

Insert into #Temp(Rownumber, Percentage) 
select RowNumber, 
       (MatchFirstName.PercentMatch * FunctionWeights.FunctionWeight)
from dbo.MatchFirstName(@FirstName), dbo.FunctionWeights
where FunctionWeights.FunctionName = 'MatchZIP'

In FunctionWeights table, I have weights column and FunctionName column that stores different function names.

dbo.MatchZIP(@ZIP) is the TVF here. Now , I have a table called FunctionWeights that stores a constant value corresponding to these function names.

Before the value is inserted into Temp table in Percentage column, I want it to retrieve the constant value corresponding to the function name that select statement has and multiply it which percentage value which was retrieved from the function. How can I do this?

With above query, multiplied value is not retrieved in the percentage column of Temp table but only the PercentageMatch value from TVF.

SNAPSHOTS:

FunctionWeights Table