Many students start their research via the discovery layer and when AskAway is available here, they can easily turn to assistance and instruction.
An embedded chat box is the preferred entry point as it's an open invitation to chat directly at point of need. The chat box should be fully visible and set to be opened (i.e. not hidden behind a collapsed menu). The title should indicate what the chat box is for, e.g. Research Help.
In some discovery layers (e.g. EDS), you have the option to include a tab. Tabs and buttons add steps to the process of getting help but unlike chat boxes they do remain visible to the user as they scroll through a list of results and when they click to chat, a new window that they can easily resize pops-up.