Move from Current Channel to Beta one on E3 subscription

Hi all,

I have Office installed plus Visio and Project. Now I am on Current Channel and would like to get into Beta one.

I added my account to beta on Microsoft Administration system, but found that this is not working on E3 subscriptions. That it needs to be done on ODT.

Any idea on how to use it? Because I have read that I do not need to install the full set again, just to use the tool to modify the channel.

Thank you.

Best regards,

Jose