I forgot my iphone passcode. How do I recover it to unlock my phone?

I just got y Iphone about a week ago and I have forgotten my passcode since I use fingerprint verification to unlock it. Last night my phone died and now I'm locked out of it due to not remembering the passcode. I don't want to attempt log in so many ties that it disables my phone/line completely so I am trying to find out how to put my phone into recovery/reset mode so that I can get back into it. I am using a Samsung Chromebook so I'm not able to download ITunes to back it up prior to wiping and resetting it to unlock it due to the fact that there is no compatible file/software for the Chrome OS. Hopefully I have a recent back up on my Apple account online but I haven't checked yet. I understand that I will lose all data stored to the phone and all my preferences and setting will be wiped or reset to default. I just need to knnow the proper steps to take to put my phone into recovery mode so I can fix this issue. Thank you so very much!