Step 1: Go to Your G+ Profile and from the Address bar copy your Google+ ID
Step 2: Go to Zipl.us and select a nickname and paste that Google+ ID. Then press GO
Step 3: After that you will get your Short URL ,copy it
Step 4: Now go to Widgetbox . firstly register if you haven't already.
Step 5: After signing in, go to Widgets menu in the header and then click the Blog/Feed Icon
Step 6: Firstly choose the Basic setting (because its free) and paste the URL you got from Zipl.us in the myblogurl field. Here one thing to note is that you will have to add /feed after the URL you got for this widget to work.
Step 7: Now after Clicking Make Widget ,you will be presented with loads of options to customize your widget according to your wishes. All options are self explanatory. This is how my widget looked after the process:
Step 8: After completing the customization Click the Save Blidget and after accepting their Terms and Conditions , Save it.
Step 9: In the next screen click the Get Widget and you will be presented with the Code to integrate it into your blog. Now just copy it.
Having problems , feel free to ask