21:8a Then Jezebel wrote letters in Ahab’s name, sealed them with his seal,

So Jezebel wrote some letters in the name of Ahab. She sealed them with his ⌊official/royal⌋ seal.
-or-
Then Jezebel wrote/composed letters and signed them with Ahab’s name. She marked the letters ⌊as authentic⌋ with Ahab’s own official mark/seal.

21:8b and sent them to the elders and nobles who lived with Naboth in his city.

Then she sent the letters to the elders and ⌊other⌋ leaders in the city where Naboth lived.
-or-
Then she sent one letter to each of the leading men and ⌊other⌋ important people who lived in the same city as Naboth.

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