I thought you were using CombatDataStorage :/
If you want to increase the Kills->
set udg_Score_Kills[q] = udg_Score_Kills[q] + 1
The deaths can be done similarly, but you need to use something other than q because q corresponds to the player id of the killer.
Just look for the local integer I'm using that's equal to GetPlayerId(n)
The assists have to be increased inside the loop at the top of the Process function.
You have to increase the number of assists using 'i'
Just place the line under the 'endif' of that 'static if' that checks LIBRARY_CombatDataStorage.
set udg_Score_Assists = udg_Score_Assists + 1