I would like to contribute to this site by offering help to IELTS students who are finding it hard to study Writing Task 1 and 2 (Academic and General). I have been teaching IELTS for over 8 years and am a native speaker.
I'm happy to see this generous offer. We have far too few actual teachers involved here—people with actual coalface experience of the difficulties learners face and the institutional hurdles they want to clear.
It will be of particular value to have someone around who can speak fairly authoritatively about what answers and forms of expression examiners actually do want, as opposed to what many of us feel they ought to want!
Max is quite right in pointing you toward the standard Q&A channel on the main ELL site; this is where our visitors first arrive, and most of them never explore any farther. But you should also make yourself familiar with Chat, where you can enter into dialogue with questioners. You will be eligible to participate there as soon as you have 20 rep, which will come with two upvotes on an answer; the 'room' you'll want to invite learners to is ELL's Cabin. When you've accumulated 100 rep you'll be able to open a room of your own.
It is not necessary for you to advertise yourself. Inquirers don't come to you, they come to ELL. All you have to do is check our site regularly and answer questions using the answer box.
There are distinctions that I should make. You should visit the tour pages for more info. Specifically,
Number 1 is usually abbreviated ELU, while the other is ELL. So if you want to help English learners, you'll want to visit ELL. English learners often mistakenly ask (learning level questions) on ELU, but their questions get migrated to ELL.
"Newest" will sort the questions from newest to oldest. "Active" will sort them by which ones recently had activity on them. These are the ones you might want to check regularly.
It does not seem that we regularly get questions regarding "Writing Task 1 and 2", but you are more than welcome to answer any other questions that interest you. If you really want to answer "Writing Task 1 and 2" questions, then you can help generate those kinds of questions by referring people with those kinds of questions to ELL.