You can use this link for help: Adobe Photoshop Lightroom Help | Lightroom Help
If you can't find Dehaze, it is because you have a version that does not have Dehaze. You need Lightroom CC 2015.1 or later, if you have Lightroom CC 2015, you can update to the latest version from Keeping Lightroom Up-to-Date .
If you have Lightroom 6, you will not get Dehaze in any version of Lightroom 6.
Thanks DJ. I had not realised that the trial had more in it than the programme. A restart of my pc brought up the link to the help page so there may have been a gremlin or two on installing!
Thanks DJ. I had not realised that the trial had more in it than the programme.
The trial of Lightroom CC (the only trial available) has the exact same features as Lightroom CC. You have Lightroom 6, which has fewer features than Lightroom CC.