On page factors:
The order of importance of html tags for SEO is arranged in the ascending order as follows :
The … must have the keywords that you are targeting in the first 65 characters. title tag is present anywhere between the and tags of your webpage.
Changing the title tag in bloggerUnder any blogger site click on Design –> Edit HTML –> just after the tag give the title of your homepage.
Changing the title tag in wordpress
In the admin logged in area in word press click on editor under the appearance menu, then click on the header.php file, here you would find the tags, between them just put your own title tag. Note : Both in blogger and word press, this tag is already present, just change the content of title tag, according to your requirement.