My stove looks rusted and I was told to "black-in" it, how do I do that.

You mean an old cast iron stove?
Lehman's (online) still sells stove black for $5. It's carbon and graphite in a tube.

If you mean a white porcelain stove with chipped paint and rusted steel showing, you have to grind the rust off with a little drill bit stone or wire wheel, and then you can buy tiny bottles of porcelain touch up paint from appliance stores. It will crackle and yellow a little but it's not too bad.

Thanks. Do you know how much I might need. It's a Earth stove, pallet burner from the 60's. About 36 by 40 by 18. Heavy as all get out. Thanks for taking your time for this. Find your blessing today.

I don't know, sorry, but I would guess just one tube. Sometimes an old hardware store will have something like this.