When you create a Guild in Ragnarok M Eternal Love, you can customize the Guild Emblems, Logo or Icon of your guild to look differently from other players guild.
However, when you click the help icon on the top left corner of the Guild icon pop-up window, it says some instruction that let you upload an image of an size of 128 x 128 and the size should be large 5M.
The thing is, it is not possible to upload your own logo in the game. The dev team probably forgot to remove this help icon.
Instead, the game comes with a Level up guild rewards where you’ll unlock more Guild icon as your guild level up in higher level.
Here are the example Guild icon available for Level 3 Guild in Ragnarok M Eternal Love.
How to Change Guild Icon
Click More, then Guild.
In the upper left corner, click the logo icon of your guild.
Now, you may change your guild icon from the available list of icons.
That’s it! Hope this clarify how Guild icon works in Ragnarok M Eternal Love.