The Accept PayPal Donations plugin is designed to easily add a PayPal donate button to your blog’s sidebar.
Here’s an example of what the widget looks like:
Once you have activated the Accept PayPal Payment Plugin just go to Settings > WP PayPal Payment to configure your PayPal Payment widget.
The plugin configuration options look like this:
Once configured go to Appearance > Widgets and add the WP PayPal Payment widget to your desired sidebar.