i need help finding the starting address for this in cheat engine

ive located what i need for the ammo, however it says [esi+000013d0],edi to find out what writes to this address, and when i search for the esi and bring it to the drop down box i do this
but it doesnt let me type in 000013D0 to add to it, i have a feeling im missing something stupid on my part.

You don't need to type the leading zeroes. Just 13D0.

thanks for the help. got a unlimited ammo hack made for the dead linger, enter the amount and it puts it in your mag.