To make a simple dedication, one can recite the two stanzas of the Practices and Vows of the Bodhisattva Samantabhadra . Or, one can choose other longer dedication prayers for a more extensive dedication.

For example, the last chapter of Bodhisattvacharyavatara: Engaging in the Conduct of the Bodhisattvas is on dedication. Its contents are all about dedications of the bodhisattvas. Certainly a fine choice for the occasion, that is.

One thing should be noted is that whether or not an aspiration prayer or dedication prayer is empowered to bestow blessing depends a great deal on who the author is. Can ordinary people like us write dedication prayers? If our motivation is pure, this purity of mind may lend certain ability, but no power to confer blessing to the prayers we write. It would not result in any benefit whatsoever to recite this kind of prayer one thousand or ten thousand times. Therefore, the author of a dedication prayer should best be a bodhisattva who has arrived at the first or higher ground, or at least a practitioner of the path of preparation who has attained a high level of realization. Only their words hold the power of blessing. Likewise, only the prayers of dedication and aspiration from them should be employed in our practice.

- Quote from The Right View, "The Three Supreme Methods"