Welcome to the community @Gikuri_2020! Would you mind having a look at our support article Managing Permissions. It should solve your issue.
But please be informed that sharing of survey projects is only possible if your user account as well as your colleagues user account are both created under the same server (i.e. either under HHI or under OCHA). Sharing across the servers is not allowed i.e. if your user account is under HHI but wish to share a project with a colleague whose user account is under OCHA server.
