When you send a message from an ad or profile page, if it's your first message to that member, it generates the start of a conversation which is recorded on your 'Messages' page in your Mindahome control panel. On your 'Messages' page click on a conversation and at the top you will find a link to the other parties ad or profile. Also all reply notifications you receive will have a link to the senders ad or profile.
You can also include the members ad/profile on your 'Favourites' page by clicking the heart on the left of the information near the top of their page.