How to add html signature (Image/Link) & Reading Pane off

Hi,

I would like to know, how to add html signature (Image/Link) & Reading Pane off in NEXTCLOUD MAIL APP?

Secondly whenever reply or forward email i get html code for formatting


.shape {
}
p.MsoNormal, li.MsoNormal, div.MsoNormal {
margin:0;
font-size:11pt;
font-family:Calibri, ‘sans-serif’
}

a:link, span.MsoHyperlink {
color:#0000FF;
text-decoration:underline
}

a:visited, span.MsoHyperlinkFollowed {
color:#800080;
text-decoration:underline
}

span.EmailStyle17 {
font-family:Calibri, ‘sans-serif’
}

.MsoChpDefault {
}

div.Section1 {
}