Specifying a particular exit node is not a wise solution, instead it is better to specify a country (better yet, exclude countries you don't want!).
You'll have to edit your torrc
file: either ExitNodes
or ExcludeExitNodes
Have a look at the Tor Manual.
ExitNodes node,node,…
A list of identity fingerprints, country codes,
and address patterns of nodes to use as exit node---that is, a node
that delivers traffic for you outside the Tor network. See the
ExcludeNodes option for more information on how to specify nodes.
Note that if you list too few nodes here, or if you exclude too many
exit nodes with ExcludeExitNodes, you can degrade functionality. For
example, if none of the exits you list allows traffic on port 80 or
443, you won’t be able to browse the web.
Note also that not every circuit is used to deliver traffic outside of
the Tor network. It is normal to see non-exit circuits (such as those
used to connect to hidden services, those that do directory fetches,
those used for relay reachability self-tests, and so on) that end at a
non-exit node. To keep a node from being used entirely, see
ExcludeNodes and StrictNodes.
The ExcludeNodes option overrides this option: any node listed in both
ExitNodes and ExcludeNodes is treated as excluded.
and:
ExcludeExitNodes node,node,…
A list of identity fingerprints, country codes, and address patterns
of nodes to never use when picking an exit node---that is, a node that
delivers traffic for you outside the Tor network. Note that any node
listed in ExcludeNodes is automatically considered to be part of this
list too. See the ExcludeNodes option for more information on how to
specify nodes. See also the caveats on the "ExitNodes" option below.
For example:
ExitNodes {us} #use exit nodes in the United States; you can also use IP addresses here, like 15.125.229.117
ExcludeNodes {ru},{ro},{pt},{ph},{pa} #do not use exit nodes from these countries