Congratulations for achieving the Gold Membership in IRC. I am very happy to see that you reached this level. Hoping to see you achieving the Diamond level soon. As for as Adsense a/c is concerned, I am sure our new member Avi has given you the right link to apply for the same. However if you applying for Adsense A/c through IRC, I am sure you must have definitely met the required criteria for the Adsense A/c which accordingly says that you should meet at least 5 out of the 6 requirements which have been stated below:
1. You should have your profile details with address updated.
2. You should have at least 10 valid articles approved.
3. You should achieve Gold Level (which of course you just mentioned you did)
4. You should receive at least 1 prize from IRC
5. You should be an active member of IRC for at least a time period of 6 months.
6. Your profile photo is uploaded and verified.
Hence once you meet at least 5 out of the 6 mentioned criteria, you are eligible for Google Adsense a/c.