In bliss, you configure rules which are used by bliss to assess your music and, if your music doesn't "pass" the rule, generate fixes to make sure it does pass the rule.
For tag correction, bliss assesses your albums by comparing them with online records of albums. If your tags diverge from the online database's records, this is when bliss marks an album Non-compliant. Fortunately, because bliss has a record of the data that diverges, it can suggest an alternative.
Assuming bliss is installed and running, visit the settings page by clicking the 'cog' at the top-right - (if this is the first time you have run bliss you'll get the option to visit that page automatically). You'll get the settings page:
Under Tags click the ON/OFF slider to enable the Tags rule. The tag correction settings appear at the top of the resulting page:
Set Check tag accuracy to Compare with Linked Releases and choose the tags that you want to compare.
Now scroll down to the bottom of the form and click Apply rules.
At this point, bliss begins scanning your music library, and will check your music contains accurate information.