Hello - any advice on how to apply for PIP?

Good morning,

This is all new to me so here goes.

i am happily retired , 4 years now, diagnosed with bladder cancer 15/3/18, undeeent Urostomy operation , still seeing the Consultant,doctor and hospital appointment etc but I remain positive throughout this journey. I have fantastic support from my family tbh.

I would like to know about the process of applying for PIP please.