I dont understand what can possibly go wrong. It has been explained several times. U have script, bypass and CE.
-Start the game with bypass
-attach CE
-Enable script (the 1 u posted) and leave it enabled (u just tick to enable and leave that way).
-In CE go to(go to means use u re mouse pointer and click) "add address manually"
when it opens in "address" type this:
MobRunSpeed
U have description(below address). Leave it
last thing is "type"(below description) it says 4 byte. Change it to:
float
hit ok
THE END.
Was it 2 hard? I can add pictures, make video with sound too

.
If u did it right it should say 8 or 10 idk in that new address. Final tip: double click on that number(what number u ask? 8 or 10 idk for sure. How? Point mouse pointer to it and double click) and type thespeed u want.
If its from "list of all public hacks" script works even offsets are good so idk what could go wrong.