To group a selection of clip elements into a chain, first select the clip elements you wish to chain. The clip elements icon will switch to the selected state.
Next, right-click one of the selected clip elements and choose Create Chain from the context menu. The selected clip elements will then be joined in a chain.
The name display of a chain is an input box and therefore editable. Single click the name display (just below the icon) of the chain to put the cursor in the input box. Type in the desired new name.