Blogger has added security measures to keep people from hacking into your account by detecting remote log ins. These extra steps don't occur all the time, but they do make it tougher to me to log-into your account to install your blog design. Therefore, I am asking that you invite me to be a contributor on your blog. This is a 2-step process.
1. Under your settings you will see a place to add authors. Click that and put in the email address of the person you want to invite to be a contributor on your blog. Once they accept they can post, but not edit anything on the blog. For a blog design installation, I need access to everything so please see step 2.