Why is stationery selection grayed out?

[Guest]

I want to add a stationery to all of my outgoing emails. However, when I go
to Tools, Options, Mail Format, the Stationery Picker is grayed out and I
cannot access it. How can I change this?

 

[Guest]

I want to add a stationery to all of my outgoing emails. However, when I go
to Tools, Options, Mail Format, the Stationery Picker is grayed out and I
cannot access it. How can I change this?

Because your mail format is not set to HTML.