Backdoor Roth and Mega Backdoor Roth are two completely different things.
For the latter, your only options are:
1) Lobby employer to add that option
2) Find another employer with that option
Unfortunately it's a major pain in the rear to figure out which employers have plans that make this feasible.
How about back door? Can I do it myself? Does it even make sense at my income level in terms of tax advantage?
Anyone* with earned income over $5,500/yr (or anyone who is married to someone with earned income over $11,000/yr) can take advantage of a backdoor IRA.
1. Open a non-deductible Traditional IRA at your brokerage of choice and fund with $5,500 (or desired amount)
2. Next day (ish) call your brokerage firm and convert your Traditional IRA into a Roth IRA
3. Make sure it actually worked and went through as you wished
4. Celebrate!
Now whether it is advantageous to you to do the above depends on many things including your temperament, gender, and hand size ... but here is a great thread to read about some things to consider:
http://forum.mrmoneymustache.com/taxes/go-curry-cracker-roth-vs-taxable/*I'm sure I'm missing some detail, so the asterisk is here just in case.
Happy Hunting!