stocks vesting

i recently left the company about 3 months ago and haven’t quite figured out a way to vest my stocks and get money from it. for context i have a fidelity account and have had been enrolled in the stocks/401k for about 6 years that i worked at starbucks for! let me know if anyone has a step by step method for this because im struggling and it seems complicated enough to the point where everytime ive asked one of my managers in the past to explain they literally cannot 😭 thx in adv!