I have a tutorial detailing the steps required to network to a KR C4, I'm sure the steps are similar for the C2:
https://youtu.be/qu1jxcGFuNIthe network credentials you're probably looking for are the kuka side ones such as the ones easily found online when searching..
• WinXPe 1.0 User name = Administrator Password = KUKA
• WinXPe 1.1 (VKSS 5.4) User name = Administrator Password = KUKA
• WinXPe 2.0 (KSS 5.2, KSS 5.3, KSS 5.4, KSS 5.5, KSS 5.6 and KSS 7.0) User name = Administrator Password = KUKA
• WinXPe 2.2 (from KSS 5.2.19 Build85 HF03, KSS 5.5 and KSS 5.6) User name = Administrator Password = kukarobxpe2
• WinXpe 3.0 (KSS 8.0, KSS 8.1, KSS 8.2) User name = Administrator Password = 68kuka1secpw59
• WES7 4.0 (KSS 8.3) User name = KukaUser Password = 68kuka1secpw59