Q: please help i used my id and passcode on another phone and now i found my orginal phone but when i use icloud it goes to the first phone i want to know how to get icloud on my orginial phone

i lost my phone a friend gave me his i put my id and passcode in his phone now i have found my phone and did the same thing but now when i go to  icloud i see the friends stuff instead of mine can someone please tell  me how to get back on the cloud with my phone