Hello Nisreen Meiqal, To draw a coordinate bond between a metal and a donor atom in Discovery Studio Visualizer, first ensure both the metal and the ligand are loaded and properly visualized in the workspace. Select the "Bond" tool from the toolbar and click on the metal atom followed by the donor atom (e.g., nitrogen or oxygen in the ligand). This action will create a bond between the two atoms. If the ligand appears incomplete, check for missing atoms or improper connectivity. Use the "Build" tool to add any missing atoms or correct the structure. Additionally, ensure that the valence and geometry are appropriate for the coordination chemistry context, adjusting bond lengths and angles if necessary. This process should result in a complete and accurate representation of the metal-ligand coordination complex.