If you've already created a personal blog, you can use settings to change its name or theme and to enable podcasting.
To view blog settings:
While viewing My Page, click "settings" and then select Blog.
While viewing your blog's homepage, click Settings.
To change your blog's name:
While viewing blog settings, edit the Blog Name field.
To change your blog's theme:
While viewing blog settings, click Change Theme.
Select a theme from the list.
If the theme includes a banner, you can upload a new banner by choosing Upload New from the Banner Image pop-up menu, then click Choose File, choose a file, and click Choose.
To enable podcasting:
While viewing blog settings, select Enabled next to Podcasting.
Choose a category from the iTunes Category pop-up menu.
Categorized podcasts are more likely to be found than podcasts without a category.