SEO Metadata For Contact, Returns, Sitemap, Register & Login

Hello I am looking for either the file or a way in admin to add/edit the metadata for the folowing...

/index.php?route=account/login
/index.php?route=account/register
/index.php?route=information/sitemap
/index.php?route=information/contact
/index.php?route=account/return/add

Also is the only way to add/edit the meadata on these pages through hard coding the php files ?

Thanks in advance.