assuming you are referring to the jive developer sandbox, you need to request access (button on the upper righthand corner of the developer homepage).
Otherwise, please provide more information on what exactly you are seeing and where. Your question is very vague.
Hi Nils Heuer
Please find the error which I am facing:
$ jiveapps create samplapp
iconv will be deprecated in the future, use String#encode instead.
c:/Ruby193/lib/ruby/gems/1.9.1/gems/systemu-2.2.0/lib/systemu.rb:29: Use RbConfi
g instead of obsolete and deprecated Config.
Enter your Jive Apps Developer Community credentials. (https://developers.jiveso
Username: Narasimha Reddy
Uploading ssh public key C:\Users\n.a.reddy.peddireddy/.ssh/id_rsa.pub
Resource not found
Thanks & Regards
Narasimha Reddy P
Seems you are trying to use the old Jive Apps framework, which has been deprecated. Take a look at this: Jive Apps (OpenSocial) - Developer Resources to get started with the new add-on framework.
Otherwise, I would suggest some formal training
Please mark the question as answered if it is answered for you. It makes it easier for the community managers to stay on top of things