In order to sign a pdf document within the UBIK mobile application you need an installed pdf reader on your mobile device.
[[File:Signing_01.png|thumb|30 px|picture Pict. 1]][[File:Signing_02.png|thumb|30 px|picture Pict. 2]]
The signing of a pdf document will be explained in following steps:
'''1. Open an existing pdf document underneath of the assigned object (Picture Pict. 1)'''
'''2. Click on any position in the pdf document in order to see the menu bar (Picture Pict. 2)'''