To share a link to an item of your project, right click on the item and select "Share a link to the item".
A link is then added to your clipboard, you can share it through your regular communication channels (email, chat etc...). To add the link in a text, right click on it and select "Copy" or use the "Ctrl - v" shortcut.
Note : To be able to open the link, the teammate you sent the link needs to have a Ubikey account with access to the project containing the item.