Question about Outlook Express

I had chosen a signature, and maybe some other stuff, but the signature seems to have disappeared and I can't find the options button to fix it. Help!

We recently got a new laptop with Windows 10.  We set up a Windows Live Mail account and recently found out that our emails are not being delivered.  They show in the sent file but are not actually going out.  HELP

Emails have been disappearing off my account little amounts of emails here and there.  Then today I checked and there was a huge chunk that disappeared.  It jumps from the few left for September to December.  I didn't delete them, I have been active with my account.  I use it every day.  I view them on the Windows live mail program on my computer and every now and again I sign in online again.  So I am active, I am not deleting them, I have the view settings at Show all.  I tried to recover, and that only brought up 5 emails from November and that's it.  The filter system has never been set to delete items after a certain amount of time.  We have it on a save all emails setting.  We are missing emails from two weeks ago and just a few days ago.  I have checked the spam and delete folders and none of my emails are in either of them.   It's like they never existed.  I also checked my online account and the same are missing on it as the windows live mail.  Any suggestions or help.  We need to figure out why this is happening.  We haven't noticed anything suspicious with our emails other than them disappearing.