You have the availability of the Help button, as shown in the screen below:

There are three options in the drop down menu:

About has links to various sites including Synaptic Software and the knowledgebase.

Technical Support which opens up contact information for our Synaptic Support Team.

If Knowledge Base is selected, you will be taken to the knowledgebase page on the Synaptic Software website.

You will then have the option to Search the Knowledge Base or Browse by Category.