This userscript Help you to Add a new Mark to BlogMarks.net:
Selecting a piece of text and click the BlogMarks's icon which appear after your selection

The script use its official Bookmarklet:
Bookmarklet
Info:
BlogMarks is a collaborative link management project based on sharing and key-word tagging.
Build on a blog basis, BlogMarks is an open and free technology.
Now, you can access your favorite URL's from any computer.
💡 You can test too My related BlogMarks userscript:
1 - BlogsMarks - Add to BlogsMarks (Userscript)
"Add a new Mark to BlogMarks.net by Selecting a piece of text and clicking the BlogMarks's icon which appear after the selection"
2 - BlogsMarks - Inputs Plus - Multiline and increase maxlength
When adding a new Marks, for all inputs, it make them Multiline and increase maxlength
3 - BlogsMarks - Enable Automatic spell checking for inputs Title, Public and Private Tags
"Enable Automatic spell checking for input Title and Public Private Tags"
4 - BlogsMarks - Convert URL text to Link
In Mark description, convert plain text URLs to links (URLs into HTML hyperlinks that are clickable)