Go to https://slack.com/apps to find LaMetric app for Slack:

Add app:

Visit http://lametric.com/business#slack to add Slack Bot. Click 'Add to Slack'.
Authorize LaMetric Slack Bot:

Almost done:

Go to your Team on Slack and check out APPS Section:
Add @lametric bot to any #channel on Slack to see messages on your LaMetric Time device
Execute `/lametric + ENTER key` to connect your LaMetric account and establish channel to device connection. Sign in with your LaMetric Account:

Select channels and your devices:
Saved.
Now go back to Slack and enjoy ;)

Read more about LaMetric&Slack integration here.