To access general settings you have to navigate to the Appearance / Customize.

In which you have the following 3 main categories to customize: Top Bar Admin Panel → Appearance → Customize → Top Bar

In the top bar you can change the background color in the color palette just by clicking and saving the color you want. As well you can drag the opacity bar slider to reduce or increase visibility of the top bar background.

Logo image

Below that you can find the logo image displayed. You can upload your own logo image there instead of the default theme logo. The logo dimensions should be height : 95px and width is of free will. The logo should be horizontal, but it's up to you in the end. Also you can reduce and increase the opacity ( visibility ) of the logo itself.

General Admin Panel → Appearance → Customize → General

In the general part, you can change the primary and secondary colors in the color palette. Just by clicking color you wish for or editing it to a custom color code.

Background image - You can import a custom image instead of the default one if you wish by clicking ‘Select Image’ and actually selecting the image in your local folders and waiting for it to save and upload. About Background Image - You can import a custom image instead of the default one if you wish by clicking ‘Select Image’ and actually selecting the image in your local folders and waiting for it to save and upload.