Sabne sahi answer diya but eska procedure itne bhi simple nai k font ka koi control panel ho and waha pe aap usay paste kersake...
mai eska bhi screenshots mei bata na chahte but abhi its too late and I have to go so eslie by words aapko samjha rahe hu screenshots ki ager baad mei zaroorat padhe then I'll provide that also:
Instructions for adding new fonts in Photoshop:
jub aap koi font download kerte hain mostly voh zipped huti hain tu usay unzip ya extract kare uskay baad voh ek same font name k folder banegi and us mei fonts honge, fonts k jho icon hote hai mostly us mei T ka nishan hota hain usay tu aap pahchante honge tu serf fonts chahe ek ya do ho copy kare uske baghair jho extra file ager ho usay buss leave as it is..
abhi yaha se asal kaam shoro hota hain aap ne Fonts copy kiye, Generally adobe photoshop Drive C mei install hote hain to us lehaz se aap Drive C >>Programe files mei jaye,
programs files mei aapko pahla jho icon folder dekega voh hoga Adobe ka tu aapko waha nai jana hain uske down side pe Common files k name se folder hain waha jaye..
pir common files mei bhi same pahla folder adobe k name se hoga, open that!
and then waha pe kafi folders honge and fonts naam ka ek folder bhi hoga,
usay aap open kare and paste your fonts there...
and pir uske baad aap photoshop open kare fonts tool mei add hue hugi..
Hope it helped you!