From past 3 days im trying to sign in my Microsoft account but i cant but please say me how to do nd my phone is windows phone 535
Update your phone to Windows 10 Mobile using the Over the Cable Updater which can be downloaded and installed to a PC (NOT to your phone) from here:
https://www.microsoft.com/en-us/download/details.aspx?id=56726
There is a readme file with instructions included in the installation, please read it before proceeding.