Step 1 : Do bitcoin to paypal deals with trusted members.
Step 2 : Head over to the Collectibles section and win a physical bitcoin auction.
If you execute the above steps successfully,your account will shine green in a month or two.
Step 1 is likely to get you negged by DT members.. People/newbies with little to no trust offering Paypal -> BTC trades and vice versa is dodgy as hell. Stay away.
Step 2 is a load of bullshit. Trust is only given if other users think you actually deserve that trust. Winning an auction and paying for your item is not likely to result in you getting positive trust from people, unless you are a trader that frequently fulfils their obligations with buying and selling.
Anyway.. do not ask for trust.. at all. Doing this is likely to result in you being negged.
All the best.