I have one of the walmart mirrors. I need to find how to hang it.

We used command strips to hang a mirror in my grandson's dorm. It worked great, just make sure to get one that will hold the correct weight.

I don't know what a "walmart" mirror is, but in general if its heavy use a French Cleat to hang it, they go from 20 lbs to 200.... https://www.youtube.com/watch?v=1wXX6rpcoqY

if its one of those mini door mirrors you can use the plastic clips that screw onto the door and when tightened down will hold in place . https://www.amazon.com/Topzone®-Crystal-Plastic-Mirror-Holder/dp/B0109O2DQK/ref=sr_1_2?s=hi&ie=UTF8&qid=1528598477&sr=1-2&keywords=plastic+clips+for+mirror

If not too heavy you can also use tow of those sawtooth hangers... https://www.amazon.com/s/ref=nb_sb_ss_i_3_14?url=search-alias%3Dtools&field-keywords=sawtooth+picture+hangers&sprefix=picture+hanger%2Ctools%2C311&crid=23Y900D7N743X

You can use mirror corners if you are attaching it it wood if not comand adhesive. I have also used self adhesive velcro tape in the past is the mirror is not to heavy.

If you are talking about a vertical plastic-framed dooor mirror, Wal-Mart sells 2-sided tape squares for them in the mirror aisle. It worked for us. You can also glue it with construction adhesive.

What is the weight of the mirror ? Where will you hang it ? What's does the back have for hanging ?

THanks everyone!