If you need to create a blog entry in Confluence tagged with certain labels, use the following link:
http://WIKIURL/pages/createblogpost.action?spaceKey=SPACENAME&labelsString=LABEL1,LABEL2,LABEL3
where WIKIURL – your Confluence server address, SPACENAME – space name, а LABEL1, LABEL2, LABEL3 – the required labels separated by commas.
Keep in mind that in the new blog entry window created by this link the set labels are not visible, however, they will be automatically added when the new post is saved.