If you cannot find Kiara after installation, check out the answer here.
If you cannot find Kiara after install in your Slack workspace, you might register wrong number of users in Kiara.
If the actual number of people in your slack workspace is different from the number of people registered with Kiara, Kiara Translator may not work.
See the user count on the #general channel.
Watch below video about how to change the user count.