Unfortunately I don't really understand what these CNames are

However, I have absolutely identical situation with my symbianexample.com domain and it works perfectly.
http://feeds.symbianexample.com/SymbianExampleFeed perfectly displays the
http://feeds.feedburner.com/SymbianExampleFeed feed
I double checked all the feedburner settings for symbianexample.com and agilesoftwaredevelopment.com. Everything is absolutely identical. Of course, it could be a feedburner's problem, but could you, please, check it once again so that I could send the feedburner's support the link to this topic?
I was following these instructions:
--------------------------
o activate MyBrand, complete the these three steps:
1.
Before beginning, make sure you can edit your domain name's DNS records.
If you aren't sure (or don't know what this is), contact your domain registrar or web hosting provider. They can guide you through the process.
2.
Create a CNAME entry in the DNS records for each domain name.
If you want to host your feeds at the feeds subdomain (this is the most common, e.g. feeds.mydomain.com), your CNAME entry should be:
feeds CNAME feeds.feedburner.com.
Note: The trailing period (after ".com") may be required. Check with your domain registrar or web hosting provider if you're not sure.
3.
Tell us what domain name(s) to use. Example: feeds.mydomain.com
* feeds.agilesoftwaredevelopment.com
* feeds.symbianexample.com
* feeds.googlersblogs.com
+ Add another domain
MyBrand works on all the feeds in your account. For example, if you have a feed at feeds.feedburner.com/myfeed, it will be available at feeds.mydomain.com/myfeed and at any other domains you specify. (Don't forget to add the CNAME entries for any domains you provide.)
--------------
(Domain names are copy-pasted from the feedburner's page, so there is no typo)
Best Regards,
Artem.