You will be directed to twitter and get this page 

You can click on the chat option in the right corner (marked by an arrow) and you'll be directed to the comments section  

This is how the comments section would appear ,use the comments section of the space start a discussion if you not willing to speak

If you want to speak and take part in the discussion click on the "Request" option in the right corner 

Your request would be sent and can be seen by the host (me and @kryptokitty) and we'll approve the request 

At last you can leave the space anytime you want by clicking the "Leave" option 

Drop in comments if you have any more doubt or anything more that i should have added 

The new profile picture of the Weekly Chat twitter handle