I have changed my password,I have found my inbox empty .what can I do?
Are you saying you believe someone has gad access to your email account if so as well as change your password try this:
Login to your online account:
https://skyid.sky.com/signin/email/
Go to Settings > More Settings > Filters and remove anything that you did not setup.
Then go to Settings > More Settings > Mailboxes > Your email address > Reply-to address
And again remove anything here that you did not setup.
Have a read of this as it might be worth a try regarding these missing emails:
https://help.yahoo.com/kb/SLN2552.html
You might want to give some thought to setting up two step verification as per this:
https://www.sky.com/help/home/sky-yahoo-mail/two-step-verif/articles/two-step-verification
If you do set this up it in important that you make a note of and keep safe the recovery code.