About how to right acc bane on referral

Does ir matters the way i write mu friend account mame on the referral?
Like, if i write aBCd or AbCd
And also Abcd or abcd... Both esta should work?

Is there a way to see how many and the name of accounts that refered me?

There is no way to see a list of people that referred you, and the names are not case sensitive. however, if someone substitutes an O (the letter) for an 0 (the number), that would matter.