Can i file my husband's return under my id or does he need his own?

The Online version is only good for 1 return. But you can use the same email address for 5 accounts.  To do another return you have to set up a new account and new user name and pay any fees again.

How to start another return in the Online version
https://ttlc.intuit.com/replies/3288574

But may I ask why you aren't filing a Joint return?  Unless you have a specific reason to file separate returns,
It is usually better to file Joint. Joint has the lowest tax rates and the highest Standard Deduction.   And if you are in a Community Property state MFS gets tricky to figure out.  Here's some things to consider about filing separately……

In the first place you each have to file a separate return, so that's two returns.  And if you are using the Online version that means using 2 accounts and paying the fees twice.  

Many people think they come out better when filing Married Filing Separate but they are probably doing it wrong.  If one person itemizes deductions then the other one must itemize too, even if it's less than the standard deduction, even if it is ZERO!  

And there are several credits you can't take when filing separately, like the
EITC Earned Income Tax Credit
Child Care Credit
Educational Deductions and Credits

And contributions to IRA and ROTH IRA are limited when you file MFS.

Also if you file Married Filing Separately up to 85`% of your Social Security becomes taxable right away even with zero other income.

See …….
https://ttlc.intuit.com/questions/1894449-married-filing-jointly-vs-married-filing-separately