When you boot, you have to interrupt the boot process by pressing any key when grub shows a countdown. Hit a
to edit the kernel options and add a space then 1
to the end of the line. Then hit return to continue booting. This will give you a root login where you can use adduser to create a normal user.
follow the prompts, then
Now login as <username>
The 1 you added to the kernel options only takes effect on that boot, it is not there the next time.