If you’re creating custom link components, define your Home tab custom links first. See Provide Custom Buttons and Links.
If you’re creating an image component, upload your image to the Documents tab first.
If you’re creating a Visualforce Area component, create your Visualforce page first.
From Setup, enter Home Page Components in the Quick Find box, then select Home Page Components.
Click New.
Enter a name for the component. For custom links, this name is displayed as the section heading in the sidebar on the Home tab.
Choose the type of component.
Click Next, and then complete one or more of these steps.
For links, select the appropriate custom links, and then click Add.
For images, click Insert an image, choose the document folder, and then select the image file. The image file must be in a public folder and Externally Available must be enabled on the document’s properties so that users can view the image.
- Create Custom Home Page Components
- If you’re creating custom link components, define your Home tab custom links first. See Provide Custom Buttons and Links.
- If you’re creating an image component, upload your image to the Documents tab first.
- If you’re creating a Visualforce Area component, create your Visualforce page first.
- From Setup, enter Home Page Components in the Quick Find box, then select Home Page Components.
- Click New.
- Enter a name for the component. For custom links, this name is displayed as the section heading in the sidebar on the Home tab.
- Choose the type of component.
- Click Next, and then complete one or more of these steps.
- For links, select the appropriate custom links, and then click Add.
- For images, click Insert an image, choose the document folder, and then select the image file. The image file must be in a public folder and Externally Available must be enabled on the document’s properties so that users can view the image.
Please refer the below link.- https://help.salesforce.com/articleView?id=home_page_components_custom_create.htm&language=en_US&type=0
RegardsRahul