# The vision of Obadiah

"The message of Obadiah" or "The prophesy of Obadiah"

# The Lord Yahweh says this concerning Edom

This tells the reader that the entire book is a message about Edom.

# Yahweh

This is the name of God that he revealed to his people in the Old Testament.

# an ambassador has been sent

"Yahweh has sent an ambassador" 

# Rise up

"Stand up." This phrase is used to tell people to get ready.

# rise up against her

Here "her" refers to Edom. This is a metonym for the people of Edom, so it could also be translated as "them."