There are a substantial number of detailed help pages available in British Nursing Database. These can be accessed by clicking the in the top right corner of the page. This opens a menu where you can select help for the current page or go to ProQuest's support centre. Other options are available, but other than the Training (LibGuides) link, you're not likely to use them.
The help pages are not specific to British Nursing Database as all other ProQuest databases work in the same way, so don't expect to find anything specific to Britsh Nursing Database. That said, the pages are extremely detailed.
The help pages open as a pop-up page, so make sure you have pop-ups enabled in your browser options.
On 16th June 2022 Ali Nazari-Nouri, a ProQuest trainer, gave a session on using ProQuest Education Database. All ProQuest databases work the same way, so you might find the recording useful, even if it's a different database. The recording of that session is below
ProQuest Training Libguides: ProQuest Platform
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