Are you talking about PsychCentral here in this forum format? If so, the best way to find your footing of what to say is to always speak from your own experiences... ppl call it using the "I" speak.

Such as: When I first came to PC I had to learn to let ppl get to know me some before I could just give an opinion. My posts had to give them examples of how I had been in that situation and how I worked through it...

It can also help to use IMO to remind us that it is your opinion, and also to add a smiley of one type or another...or say TC (take care!) ok? TC!