To add a text cut, what you want to do is insert “<!— more —>” right before the cut you want to make. Be sure to do it on the html sheet (as in, click the button that says “html” and enter the tag in there), not the plain text processor. If you’ve done it right, the processor should look like this:
[Image: a tumblr word processor. The title is “Title [Trigger Warning: Violence Against Women” and the text says “trigger” in all caps and 72 pt font four times. After the first “trigger,” there’s a dashed line that says “read more” right under it in small letters.]
The line that says “read more” on the processor marks where the text will cut off on your blog and your followers’ dashboards. Here’s the html I used to make the above post:
<p class=”MsoNormal”><span style=”line-height: 115%; font-family: "Verdana","sans-serif"; color: black; font-size: 48pt; mso-fareast-font-family: ‘Times New Roman’; mso-bidi-font-family: ‘Times New Roman’;”>TRIGGER <!— more —> TRIGGER TRIGGER TRIGGER</span></p>
You don’t need to know anything about the “<p class=…blahblahblah.” All you need to see is that all of the text after the bolded tag is under the cut. Ta-da?
Here’s what a text cut looks like when it’s all nice and published:
[Image: a published tumblr text post that says “Title [Trigger Warning: Violence Against Women]” and then “TRIGGER.” Underneath, there’s a link that says “Read more…”]
Your readers can then click the “Read more…” link to read the rest of your post.
Update: adding in the HTML works for all kinds of posts, but for text posts you can also hit the “cut” button between the icons for spellcheck and HTML.