its a plugin the allows you to edit the item ur holding

Spigot - https://www.spigotmc.org/resources/item-editor.27637/

this can be done with skript, in fact here is one

https://www.spigotmc.org/resources/flintname-the-renaming-solution-free-skript.32426/

You can also use the plugins "NBTEditor" and "CreateYourOwnMenus (only works for lore and display name of item)" to edit items.

<span style="color:#e74c3c"><span style="font-size:28px"><strong>hi, these are things i like:<br />      - playerservers (fun and good ones)<br />      - terraria<br />      - pickels<br />      - Trove</strong></span><br /> <br /> <strong><span style="font-size:18px"></span></strong></span><strong><span style="font-size:18px"><span style="color:#9b59b6">if you ever need my help, don't contact me.</span><br /> <span style="color:#2ecc71">updated my signature (this place) 1st October 2019<br /> (added trove)</span><span style="color:#9b59b6"></span></span></strong>