Toning the under arm?

triceps exercises will build the triceps. but you cannot spot reduce fat under the arm. You must lose total body fat.

close grip bench press, skull crushers, triceps extensions, and as a finishing move, triceps pressdowns.
don't waste your time with tricep kickbacks.
 
To add on to malkore's post, to lose overall body fat we must workout regularly and eat a clean diet.

The tricep is the part of the underarm you are referring to. You can work that muscle by doing a variety of things, but I suspect you are more interested in getting rid of extra fat.

If that's the correct assumption, do a total body fitness plan with weights, do a mix of high/short and low/ong cardio sessions. Rest adequately. Eat small meals throughout the day (protein and carb with each meal).
 
If you are like my mom, you may just have extra skin on your arms. (She lost 90 pounds). She works out very hard (more than I do), but the skin just never goes away. She decided to just build up big muscles - she has always been very athletic, softball/basketball player - and no, the skin isn't gone but there is big improvement.

My favorite tricep exercise is the chair dip, where you walk your feet out from your chair (or bench) and dip down, using your own body resistance. An advanced version of this would be to have your feet on another chair across from you.
 
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