You need 10 good quality posts here on TMS and you will get the TMS code, alternatively, try Roamler's FB site, very often they give them out on the page, or, ask a Roamler user who may have a spare invite (But be aware, many people take these invites on the understanding they complete Level 1 (unpaid training level) at which point the user gets £2 and a small percentage of earnings onward, but, many people throw in the towel on Level 1, as they find Roamler is a wee bit harder work than they think it will be, which holds them back from giving invites out.