At the top of the page it says 'please visit our sponsors'...most if not all of those sites offer a free account (but limit how many emails you can do or some other type of limit). Set up an account, see which site has the most people in your area, and (and this is very important) JOIN the site with the most locals. It only costs a few $s and lots of members will ignore free members as being fakes or flakes. After that, start trying to find a good match for the two of you. At the same time, you should be discussing your limits and rules. Know that you can always modify these as time progresses but never violate them without talking about it in a non-sexual situation (in other words, don't get caught up in a sexual scene and then change the rules for any reason, swinging is all about trust). Once you find another couple (or single), say hello and start communicating.
Personally, we don't believe in spending too much time emailing and/or texting. You will find out more in 5 minutes in person than you will ever find out writing. Set up a meeting for drinks or dinner and meet. We also recommend that the first meeting is just for meeting and nothing else (no play). This takes the pressure off of everyone and allows you to talk with your partner in private. If everything goes well in the first meeting, then the second meeting...well, the sky is the limit (or should I say your rules are the limit). Don't take it personally if everything seems to go great only to find out that they aren't interested. It saves a bunch of time to find out now than find out later after weeks of communicating. IT IS NOT PERSONAL! Don't take it as such, it just isn't a match, move to the next couple (or single).
Singles: Finding a single guy in the L/S is like finding a cheese burger at McD's...you can't throw a french fry without hitting one. Finding a single woman...well, they are called unicorns due to their rarity. If you do find one, treat her like the treasure she is.
Finally, universal rules: always ask permission first, don't assume that something is okay. No means no, don't ask a second time.
Personal rules: Play as a team, don't ever 'take one for the team'. If one of you says no, then both of you say no...no explanation required. The rules don't change after the game starts (only when they can be agreed upon by the both of you in a non-sexual situation).
I'm sure I left things out, but fortunately, the group here will chime in as to what we overlooked.