You can create the pull requests from Github portal or you can install gh cli on local machine and then create and merge the pull requests from local machine itself. But, this level of privilege may not be provided to individual developers.
Install the gh cli
gh auth login
Follow the instructions to set up cli.
Create the pull request
git checkout feature1
gh pr create
#or
gh pr create --base main --title "My first cli PR" --body "Raising a new PR"
gh pr create --title "The bug is fixed" --body "Everything works again"
gh pr create --reviewer monalisa,hubot --reviewer myorg/team-name
gh pr create --project "Roadmap"
gh pr create --base develop --head monalisa:feature
gh pr create --draft
gh pr create --web
gh issue list
gh issue view 10
gh issue create
gh repo create some-org/another-repo
gh repo clone some-org/some-other-repo
gh pr status
gh pr list
gh pr checkout 123
gh pr view 123 --web
gh pr review --approve
gh pr review --comment -b "interesting"
gh pr review 123
gh pr review 123 -r -b "needs more work"