What is a Signature?

[Rarus]

Hello,
Perhaps a stupid question, but the (german?) help seems not to be up to date. I tried to upload a new typeset and got a page with the header "IMSLP Licensing Agreement". There I shall give my signature. What is a signature? A sort of password? Or my user name? Or ~~~~? Or must I take my pencil an sign on the notebook screen? And what are "certain identifying characteristics"?
Sorry for this.

[Rarus]

I'm too timid. Signature is ~~~~, and "certain identifying characteristics" seem to be the pressure and the angle of my pressing the keys of my laptop (informations provided by the NSA). Forget it. And sorry.
(But there could be a short mention of ~~~~ on the page, for people less used to computer English . . .)

[Carolus]

Just type in "Rarus" instead of 4 tildes. The disclaimer form you 'sign' when uploading a typeset doesn't read the tildes.