I meesed up on my codes to put in after watching YouTube and I new better also

Have 2001bmw x5 3.0 and I was trying to turn
off the abs lights and I pushed the  mile
button on dash and then went 18 on the code
thing I didn't add up last four numbers like I
should have and now my lights flicker when I
put my key in and worn start what do I do to
reset it and please help I'm homeless and job
less was trying to fix my bmw so I could sell it
or get a job and now this virus  . I dont know
what to do ....