how to boost my output to -2 Db

I have Sonar Home 6.2.
When I export mixdowns it seems like they are a bit quiet and I'd like them to be bouncing up to -2db.

How do I get the mixdown volume boosted?   

Yes, you have Boost 11. It was introduced with SHS6XL, much to the chagrin of many Sonar users.
You are following good practice, and routing all of your audio tracks(including bus outputs) to the master bus, correct?
Insert Boost 11 in the FX bin of the master bus.
Follow that with Voxengo SPAN. This will help you keep track of clipping and overhot frequencies.
Be prepared to adjust individual track EQ(you have Sonitus EQ available in the Console View, or you can work with you choice of third party EQ's)
Also, you may actually have to adjust some of your track levels down.
I used Boost 11 on this track:
http://soundclick.com/share.cfm?id=10285834
On initial application of Boost 11, it sounded like utter crap. I had been pushing the peaks for more volume, and it was clipping like crazy.  After some jucidious adjustments, It got where I was comfortable with the sound.
You have some powerful tools in SHS6.
Use them, and trust your ears.

Thanks all,... the Process / Audio / Gain is useful. I tried the Boost11. I right-clicked on the master bus and added it. It took ages to deploy and I thought the program had crashed. But it didn't work for me. On the tutorials I've seen, the active waveform scrolls from right to left as its being processed, but in my case there was no wave form visible and it had no effect. (yes, I did enable it and click the switch etc).

You need to define -2 dB as either peak or rms. Some ommercial recordings are WAY hotter than the level that Kalle is suggesting as well. They do not sit at -15 as he has said.  (maybe some of the louder ones are around -10) Most commercial CD's are around - 7 dB rms. I know its loud but the facts are that is where most of them are. I have mastering quite a bit lately and often have to deal with clients wanting their projects to be as loud as commercial CD's so I have been doing a lot of measuring in this area.

Boost 11 is not even worth talking about. It is not a good limiter period. In order to get levels sitting up at -7dB rms without any distortion you have to invest in a serious limiter such as the PSP Xenon. It can do it but at a cost though. The new Sonar concrete limiter sounds like it is a much better option compared to boost 11  as well and might be in the ball park of getting your levels up high as well.

But getting good levels in your final result actually starts further back from the final limiting stage. It starts right back in your tracking levels and mix processing etc..

Another very good limiter which can be very transparent is the TRackS3 Brickwall Limiter.

It's currently retailing for €74.99 here.