When you monitor a discussion forum, you are notified of contributions to the forum
by email. Monitoring a forum is the same thing as subscribing to a mailing list.
A bell icon in the Monitoring column indicates that you are
subscribed to a forum.
It looks like this:

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If you prefer to do it by e-mail:
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To subscribe in message by message type subscription, send an email to
<mailing list name>-project
name-subscribe@domain.
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To subscribe in digest type, send an email to <mailing
list name >-project name-digest-subscribe@domain
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You can also change the subscription type from message by message to
digest and vice-versa.
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If you prefer to do it through the web interface:
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Click Monitor.
Set the notification frequency using "Monitoring Preference" as it
suits you.