Unable to SSH into ec2 instance or open it in browser

Hello Experts,

Trying to install a AWS ec2 instance. Tried the following steps but unable to ssh to the instance or open the instance url in the browser.. kindl help me out. Thanks in advance.

Step1: Created a keypair
(prompt$) ec2-add-keypair ubuntuInstance10.4Keypair1
KEYPAIR	ubuntuInstance10.4Keypair1	87:11:8f:c9:c5:53:14:6e:2a:92:07:20:03:7a:10:fb:7a:01:07:c3
-----BEGIN RSA PRIVATE KEY-----

<keypair code here>

-----END RSA PRIVATE KEY-----


Step2: Saved the above private key in a file (ubuntuInstance10.4Keypair1)

Step3: Changing the permissions of the private key
(prompt$) sudo chmod 600 ID_RSA_ubuntuInstance10.4Keypair1 


Step4: Running the instance having the AMI as "ami-5ed62337"


(prompt$) ec2-run-instances ami-5ed62337 -t t1.micro -k ubuntuInstance10.4Keypair1
RESERVATION	r-22efba4f	791715039698	default
INSTANCE	i-aa558cc5	ami-5ed62337			pending	ubuntuInstance10.4Keypair1	0		t1.micro	2011-03-27T15:12:51+0000	us-east-1d	aki-754aa41c			monitoring-disabled					ebs		
(prompt$) ec2-describe-instances
RESERVATION	r-22efba4f	791715039698	default
INSTANCE	i-aa558cc5	ami-5ed62337	ec2-67-202-5-28.compute-1.amazonaws.com	ip-10-204-202-127.ec2.internal	running	ubuntuInstance10.4Keypair1	0t1.micro	2011-03-27T15:12:51+0000	us-east-1d	aki-754aa41c			monitoring-disabled	67.202.5.28	10.204.202.127		ebs		
BLOCKDEVICE	/dev/sda1	vol-296a5541	2011-03-27T15:13:08.000Z	



Step5: Authorizing the port (this command failed)
(prompt$) ec2-authorize default -p 22
Client.InvalidPermission.Duplicate: The permission '0.0.0.0/0-1-22-22' has already been authorized on the specified group


Step6: SSHing to the instance (This command failed)
(prompt$) sudo ssh -i ID_RSA_ubuntuInstance10.4Keypair1 root@ec2-67-202-5-28.compute-1.amazonaws.comip-10-204-202-127.ec2.internal
ssh: Could not resolve hostname ec2-67-202-5-28.compute-1.amazonaws.comip-10-204-202-127.ec2.internal: Name or service not known


Also tried to open the instance(ami-5ed62337) in browser as http://ec2-67-202-5-28.compute-1.amazonaws.comip-10-204-202-127.ec2.internal
this resulted in the following messages

"Oops! Google Chrome could not find ec2-67-202-5-28.compute-1.amazonaws.comip-10-204-202-127.ec2.internal"

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