Currently Learning Toolbox does not support live collaborative editing of an ePoster by multiple authors. Instead each ePoster has one person who takes on the editing author role.
If you have been sent an invite link to create an ePoster for a conference, then the first person who follows that link will be given the editing role.
The person who takes on the editing author role will be able to add their co-authors’ names to the ePoster by adding their names in the Stack Poster Details Tab and can also specify who will appear in the summary view as the Named Author. However, their co-authors will not be able to edit the ePoster.
The editing author can also share the link to the ePoster with their co-authors (How do I share an ePoster from my computer) so that their co-authors can view the developing ePoster and email them with any feedback or suggestions. If they do this then they should make sure they change the ePoster permissions from Private to Hidden and Anonymous Access (How do I set access permissions) before sending the link to their co-authors.
If your co-author has followed the invite link after you then they will get a message explaining that the link has already been used. If you would like to switch the editing role to them then just contact support (the team who are supporting your use of Learning Toolbox) and they will be able to do this for you.