Now, I will show you how to create such button in very simple steps. Just follow me.

Step 1:

Goto Google Drive and sign in using your Google account.

  

Now click the upload button.



Now a new window will appear. There will be a link in "Link to share" TextBox (See the picture below). Copy this link and paste it in notepad.

Now Look In The First Link Which You Copied From Google Drive. It Will Be Having File ID which Looks Like 0B3s-Oiwdlw9tZDFpSGlUN1NZNVE
Copy this File ID and Replace It With PASTE-FILE-ID-HERE in The Second Link Which You Copied From Here.
Now, The Second Link Will Look Like This 

https://docs.google.com/uc?export=download&id=0B3s-Oiwdlw9tZDFpSGlUN1NZNVE

This whole process is demonstrated below:

Step 2:

Now go to blogger and create a new post.

Click HTML.

Step 3:

Now paste the following code there.

<FORM>
<INPUT Type="BUTTON" VALUE="Home Page" ONCLICK="window.location.href='PASTE-HERE-THE-LINK-YOU-CREATED-AT-THE-END-OF-STEP-1'"> 
</FORM>

This is it. You have successfully created a Button. Now you can reposition the button by click "Compose" (at left of the HTML button - see picture below)

If you want a specific webpage to appear when the user clicks the button (Like the 2nd example), paste the link of the website in the place of " PASTE-HERE-THE-LINK-YOU-CREATED-AT-THE-END-OF-STEP-1 " in the above code.