The first thing you should to do is register. Make sure your have entered a correct email address, and take note of the password you have chosen. You will need it for logging in.
Shortly after the registration is completed, you should receive an email for the confirmation of your email address. If you haven't received it, you could have mistyped your email address (in which case you should register again) or the email could have ended up in the spam folder.
Once you have found the email address confirmation message, open it and click the link which allows you to confirm your email address.
Then you can login with your nickname and password. This will allow you to post a talk proposal or to contact the proposers of talk proposals.
At any time you can browse the talk proposals posted by other users. If you are looking for talk proposals about a particular topic, subject or in a specific language, you can use the appropriate selection criteria to find them.
If you have found a talk proposal of interest, you can contact the proposer by clicking the contact button. This button is normally hidden, and becomes visibile by clicking the menu icon (three tiny horizontal lines) associated with the talk proposal.
You may want to browse the users' profiles using the available search criteria.
If you wish to send a message to a particular user, click the "contact ..." button associated with him/her. This button in normally hiddden, and becomes visibile by clicking the menu icon (three tiny horizontal lines) associated with the profile.