Once you have picked Trinity as your routine, you need to load a profile.
Click the Load button
Find your DemonBuddy Installation
DemonBuddy > Profiles > Adventurer
Now pick a profile that matches what you want to do.
Hit start and wait for it to load into game. Once it's in the game, give it a few seconds. Once it starts moving around you can hit STOP on the bot.
Once you have done that, you can go to "Plugins" at the top. Select Trinity and click CONFIG.
These are all of the Trinity settings. Take a look through all of the tabs to set things how you like. Generally speaking most things are working well as they are.
I would suggest going to the DemonBuddy Forums > Plugins > Trinity section and looking at the stickies. You will see a guide there on how to use ItemList.
Once you get more acclimated to the bot, I would also suggest the Arcanum Plugin found in the stickies of the Plugin forum section. It will help you enchant items.
Happy Botting.