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.
Code:
adduser <username>
passwd <username>
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.