Hello

I have used CB blog in my site but when i am added my blog from font-end as user

i can not added iframe code in site i have used JEC editor.yes i have enable default profile in media manager iframe allow yes option in joomla configure Nofiltering set for user group
when i click on create bolg i got error 406 Not acceptable see attchment

CB filters out iframes by default. You need to whitelist it within CB > Configuration > User Profile and write in Exclude Tags from Filtering textbox the word "iframe"