There are a variety of commands available to make your stay more enjoyable.
Listed here are general usage of chat.
Documentation here primarily focuses on the use via CHAT HERE

#Lobby is the default channel you join when using our Web Chat. You're welcome to leave and join your own channel at any time.
You can also add your channel's chat to your own website by using link https://wc2.tochat.org/<#channel> (IE https://wc2.tochat.org/#Lobby )

To Join Channels:
/join <#channel>
This allows you to join a channel. KEY is only needed if the channel is password protected.

To Leave/Part Channels:
/part <#channel>
Listing a channel is not required. It will cause you to leave the current room you're chatting in.

Changing your Nick:
/nick
This allows you to change to the nick of your choice. Remember: Some nicks may be registered and force you to use a different nick.

Giving Op Status:
/mode <#channel> +o
This gives operator status to specified nick. This allows them to change topic, invite, kick and even ban users.
Make sure you trust who you're giving this ability to.

Giving Half-Op Status:
/mode <#channel> +h
Gives Half-Op status to nick you specified. Reduced permissions given. Cannot Control Ops or above.

Giving Voice:
/mode <#channel> +v
Grants specified nick a voice. Voice is required with channel is set to be moderated. Only voiced users and above can chat.

You can take any of those status away by swiching to a minus (-) instead of a plus (+)

Channel Management can be done using the panel on the right side using gear icon at top.