Need Advice on Putty

I'm basically new to this interesting hobby n had bought a Fujimi kit to try to build one.. but somehow or rather, i found that after joining the front bumper and the main body together, there's a gap in between... so i've bought Tamiya Putty ...somehow, i do not know how to apply or wat to mix wif (if there's any) to achieve the desired results..

So could someone pls guide me along on the correct method to use the putty??

Thanks

wrong forum but what kind of tamiya putty did you buy ?
basic ?

if so you don't need anything to mix, just use it, wait 1 hour and sand it

tks Vric... will try again...