I added a vector 'loc' attribute using Attribute create node, then the spreadsheet shows this and I can edit the this value.

then a added I Attribute Wrangle node after this node and change another attribute by using VEX

this 'myName' attribute show correct on spread sheet, however all attributes are no longer editable.

Can someone help me how to make my spread sheet can edit again, and by any chance explain why this happen and how to avoid this?

Thanks

lol don't edit the spreadsheet

Generally speaking, as jsmack said, it's a very bad idea to edit the spreadsheet directly.

But if you want to do it, for debugging purpose, you can just add a new Null SOP and edit it there.