You can add Skype contact details to your profile so that other forum users can get in touch with you. When you do this, a small speech-bubble appears next to your posts which can be clicked to reveal how you can be contacted - see below:
To make this happen, do the following:
1. Click your username on the top-right of the forum and select 'Profile' from the menu:
2. Click the 'Edit Profile' link:
3. Scroll down and put your Skype ID in the relevant box, and then click Submit:
That's it! This obviously works for other instant messaging services too. See how you get on and post questions on this thread if you need help.