Put the droplet code "meta-index" into the head section of your template and you are done.
Edit single pages, that should differ from the standard, in the admintool section.
index, follow
The spider will now index your whole website.
This is the standard, if you did not edit your pages.
index, nofollow
The spider will now only look at this page and stops there.
noindex, follow
The spider will not look at this page but will crawl through the rest of the pages on your website.
noindex, nofollow
The spider will not look at this page and will NOT crawl through the rest of your web-pages.
See further details on metatags.org.