Today, I accidentally deleted the signature, and found that the newly created signature could not be edited, and there was no solution to the problem online.
The solution that windows7 Foxmail can't edit the signature mentioned here is not to edit the signature directly in Foxmail's editor, but another solution.
There are two ways to modify the signature.
1) is to go to another system or any system that can edit the signature with Foxmail, edit the signature, and then find the signature under the Signatures of the Foxmail installation folder and copy it to the Signatures folder corresponding to Foxmail in the system that cannot edit the signature. For example, d: \ program files \ foxmail \ signatures.
2) Use any HTML editor to edit the signature information, and then when creating a new signature, select "Use this file as a template (t)" instead of "Start with a blank signature (k)" or "Use an existing signature as a template (e)" in the signature creation method, because you cannot edit ~. . Then select the edited signature file and complete the next step.
The above comes from the network.