How to add more Host to my account

I believe you can do it through Adobe's website, or you can reach out to the Support group for Adobe Connect: Adobe Connect Help | Adobe Connect Support

Alternatively, you could reach out to a reseller and get a larger capacity Name Host licenses with additional account functionality for the same or less than what you pay through Adobe's website. Adobe Connect | Strategic Partners

You can work with a reseller in your region to covert your account and add licenses.  This will also increase your room size to 100 for about the same price.  My company, Clarix Technologies covers the US and Canada, WebQEM covers APAC and several option exist in EMEA.

Here is the list of Partners:

Adobe Connect | Strategic Partners

Tom Gunter-Kremers | Clarix Technologies, Inc.

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Tel:  585.899.5300 x166 | Fax:  585.899.5464

1000 Pittsford-Victor Road | Pittsford, NY 14534

Email: gunter@clarix.com