To add meta tags to flatpress blog you have to create a plugin.Its very easy just follow instructions below

Step 1 – Create Plugin File

* Create the file “plugin.headstuff.php” on your PC using a text editor such as notepad, notepad++, or PSPad.
* Go to the Headstuff Plugin web page

* Click the HeadStuff source link
* Copy the headstuff plugin code into the file “plugin.headstuff.php”.
* Change this section of code

echo <<<HEADSTUFF
<!-- put whatever html tag you want here(meta tags,google webmaster ,etc..! -->
HEADSTUFF;

to

echo <<<HEADSTUFF

<TITLE>READ AND DOWNLOAD</TITLE>
<META NAME="description" CONTENT="downloads,ebooks,notes,games,reviews,freeware more..">
<META NAME="keywords" CONTENT="downloads,ebooks,notes,games,reviews,free stuff,ccna,mcsa,freeware">
<META NAME="robot" CONTENT="index,follow">
<META NAME="copyright" CONTENT="Copyright � 2010 ourblog.110mb.com. All Rights Reserved.">
<META NAME="author" CONTENT="ourblog">
<META NAME="generator" CONTENT="www.onlinemetatag.com">
<META NAME="language" CONTENT="english">

HEADSTUFF;

* Save file

Step 2 – Upload Plugin

* Switch to folder fp-plugins
* Create Folder “headstuff”
* Switch to folder headstuff
* Upload the file “plugin.headstuff.php” you created earler to the folder headstuff.

Step 3 – Enable Plugin

* Logon onto your blog site.
* Go to Admin Panel > Plugins.
* Scroll down to the plugin headstuff
* Click Enabled, which turns into Disable.
* Go to Maintain page.
* Click on purge theme and templates cache.
Now metatags are added to your flatpress blog.To generate meta tags automatically click the link meta tags generator and enter the details.

To check meta tags are working fine or not, click this link meta tags generator