Hello,

Please go to file \wp-content\plugins\codeless-builder\assets\js\cl-builder.js and find these lines:

editor_params = {
                                    toolbar: {
                                        buttons: [
                                            'bold', 
                                            'italic', 
                                            'underline', 
                                            'subscript', 
                                            'superscript',
                                            'justifyLeft', 
                                            'justifyCenter', 
                                            'justifyRight', 
                                            'justifyFull', 
                                            'highlighter',
                                            'dropcaps',
                                            'blockquote',
                                            'removeFormat',
                                           

Add 'anchor', at the end of the list. Save changes and refresh site. The link option will be added to your text speedy editor. Like in these screenshots:
Code: https://ibb.co/BNN088h
Result: https://ibb.co/GCzH4YF
I can do the change for you but the site is no longer accessible.

Best regards!