If you are seeking assistance with your MegaSquirt® project, you should post your questions in the forums dealing with your configuration and MegaSquirt® product. You can find the list of forums here.
Depending on how they've set their account, you may be able to email them through the envelope icon under their name.
We generally discourage "sharing" tunes because of variances in engines and installations may cause poor performance or they may cause significant damage to the engine. If someone has taken the trouble to build one of the B&G MS systems to get max performance, they're not likely to want to settle for someone else's settings which will be a compromise. There are instructions for a base setup in the manuals and in the initial software install which will generally get the vehicle running and then allow the user to tune for optimum performance. Assistance is available for questions along those lines in the other forums.