From your project list, locate the three dots icon on the project that you want to change and choose edit.

Yes. And you can find more info of these keyboard shortcuts via the Help Menu.

You can make the Revision History work automatically by locating this feature. Then, click the icon to access the Autosave settings.

Certainly, you can copy partial or entire content between pages by following these steps:

1. Select the desired elements from the source page (you can use Ctrl/Cmd + A to select the entire page content).

2. Copy the selected content by using Ctrl/Cmd + C.

3. Paste the copied content into the destination page.

Check the price here: https://mockyapp.com/pricing/

Yes, a 30-day trial period for Mocky is typically available

For Data Center edition, you can extend your app trial up to 5 times - in other words, for up to six months. 
Extend your trial by generating a new evaluation license key from Atlassian Marketplace.

Follow these steps

1. Navigate to Manage Add-ons in the JIRA Administration.

2. Find the Draw Wireframes, Mockup, Prototype & Diagrams plugin.

3. Delete the existing license key.

4. Click the Free Trial button.

You should now have a new trial license for 30 days.

For Cloud edition, basically Atlassian does not allow the extension of trial licenses. However, in some special cases, it may still be possible. You can contact Atlassian Support directly for more details.