As long as you not yet submit and get the "pengesahan" chop, no worries.
Just go back clear everything and same as empty.
Logout, and login to correct e-BE form to fill up again.

But if you fill up e-B , should not have major problem also, since you submit before end-June.
If get audit, just say you join Amway/Cosway, but no sales and profit.
If don't get audit, just leave it. Next year submit e-BE.

If want to follow 100% full procedure, and you already submit "pengesahan", then goto LHDN, find officer, lodge case to inform them, then you may need to re-submit e-BE again, etc.

if you forgot to declare your income in the previous year, you can declare here,