I have a 401 k loan and would like to know my payoff
You should contact your plan administrator (record keeper) by phone. They should be able to easily tell you the payoff amount and the options for making the payment.
As indicated in the above responses, you should contact the number on your 401(k) statements. It is important that you ask for the "payoff" amount of your loan. This can be slightly different due to interest than the loan amount that shows up on a statement or online. Typically, you will just mail a check in this amount to the plan administrator. If you are no longer with the employer, it is not uncommon to have a 60 day period after employment ends to payoff your loan. I hope this helps.
You need to contact the plan administrator. Call HR and get their phone number. You can also get directions from the plan administrator, and possibly HR, to register and log in to their online portal, where you can view it any time.