Do you see the segment you wish to edit when you go to Components >> Segments? If not, click on Other filters at the left hand side bottom of segment screen >> Click on Show All. It will make all the segments visible for all the users. This is only available for Product admin users.
Open that segment, do you get Save option? If not means there could be some issue with your admin rights.
Only an Analytics product admin can edit the segments of other users and save them. Other non-admin users with Segment creation access would be able to access and "Save As" the segment shared with them by other users means they can create a new segment by editing a segment shared with them but cannot re-save the original one.
Do you see the segment you wish to edit when you go to Components >> Segments? If not, click on Other filters at the left hand side bottom of segment screen >> Click on Show All. It will make all the segments visible for all the users. This is only available for Product admin users.
Open that segment, do you get Save option? If not means there could be some issue with your admin rights.
