Where can I find the B.Pharm admission form for IIT BHU Varanasi, and what is the application process?

Yes, IIT (BHU) Varanasi also conducts a B.Pharm course, but curiously the course is named B.Tech in Pharmaceutical Engineering & Technology. If you wish to apply, no special BHU admission form is required for this course.

This is how you can use it:
Step 1: First, apply for JEE Main at [jeemain.nta.ac.in].

Step 2: Clear JEE Main and apply for JEE Advanced at [jeeadv.ac.in].

Step 3: After clearing JEE Advanced, go to [josaa.nic.in] and participate in JoSAA counselling.

Step 4: As you select your options, select "B.Tech in Pharmaceutical Engineering & Technology" at IIT BHU (this is what you want!).

You don't need to complete any independent IIT BHU or BHU application form. JEE and JoSAA take care of everything.